Chirally symmetric and confining dense matter with a diffused quark Fermi surface

TL;DR

This paper investigates the possibility of a confining, chirally symmetric phase of dense matter with a diffused quark Fermi surface, showing that diffusion does not preclude such a phase at low temperatures.

Contribution

It introduces the effect of Fermi surface diffusion on confining, chirally symmetric dense matter, extending previous models with a rigid Fermi surface.

Findings

Diffusion of the quark Fermi surface does not eliminate the confining, chirally symmetric phase.

The study supports the existence of a confining, chirally symmetric phase at low temperatures.

Diffusion effects are significant but compatible with the phase's stability.

Abstract

It is possible that at low temperatures and large density there exists a confining matter with restored chiral symmetry, just after the dense nuclear matter with broken chiral symmetry. Such a phase has sofar been studied within a confining and chirally symmetric model assuming a rigid quark Fermi surface. In the confining quarkyonic matter, however, near the Fermi surface quarks group into color-singlet baryons. Interaction between quarks leads to a diffusion of the quark Fermi surface. Here we study effects of such diffusion and verify that it does not destroy a possible existence of a confining but chirally symmetric matter at low temperatures.